Flexible cooling device made by UCLA engineers. Photo: UCLA Engineering

Researchers from UCLA and SRI International have developed a flexible, lightweight, cooling system that — if it can be mass-produced cost-effectively —could become a competitive cooling technology for small devices.

The problem: Vapor compression cooling systems used in air conditioners, cars and refrigerators are too large and bulky for much smaller applications like keeping smartphone batteries cool. Ceramic materials can be used but so far have been costly and less efficient than conventional cooling systems.

What they did: The researchers layered thin films of a polymer between two aluminum plates — one that was the source of heat (representing a smartphone battery, for example) and one that absorbed heat. As they applied and removed an electric field over the films, the polymer acts as the refrigerant — and moves heat back and forth between the plates. Repeating that process, they were able to cool a smartphone battery by more than 14 degrees Fahrenheit in 5 seconds.

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Trump's new TikTok threat

Photo illustration: Aïda Amer/Axios. Photo: Jim Watson/AFP via Getty Images

President Trump said twice Monday that the U.S. Treasury would need to get a portion of the sale price of TikTok, as a condition of regulatory approval.

Why it matters: This is akin to extortion — the sort of thing you'd expect to hear on a wiretap, not from the White House in front of reporters.

Ford names James Farley as new CEO amid ongoing turnaround effort

James Hackett, left, is retiring as Ford CEO. Jim Farley, right, takes over Oct. 1. Photo: Ford

Ford announced Tuesday that James Farley will take over as its next CEO, replacing James Hackett, 65, who is retiring after three years in the job.

Why it matters: It leaves Farley to complete the company's ongoing turnaround effort. The transition will be that much harder as the industry tries to navigate the coronavirus-induced economic slowdown which shuttered Ford plants for two months on the eve of some of its most important vehicle launches.

Updated 4 hours ago - Politics & Policy

Watch the full "Axios on HBO" interview with President Trump

In this episode of “Axios on HBO”, President Trump discusses his handling of the coronavirus pandemic, the upcoming election and much more with National Political Correspondent Jonathan Swan.

The interview was filmed on Tuesday, July 28 and aired Monday, Aug. 3 on HBO.